I missed this just before christmas, but have already submitted 2 widget designs into the N97 Widget Design Competition. Just goto the link below for full inststructions on how to take part.
The winning widget will go into production, and the winning widget designer will receive a production-mode Nokia N97 ahead of the public release, pre-installed with their homescreen widget.
The closing date for the competition is February 27, 2009. The winner will be announced on this site on March 13, 2009.